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Some cabin air filters can stop particles as small as .2-.3 microns in size, which is the same size a N95 approved face mask can filter out. But, this is not the only health reason to install a new cabin air filter.
Cabin air filters remove dust, pollen and soot. These particles can cause respiratory distress. Also, debris entering into the case that houses the evaporator and heater cores can be food for bacteria that can cause other illness like pneumonia and the common cold. This video is sponsored by Auto Value and Bumper to Bumper.